在矩形ABCD中,AE⊥BD于点E,点P是边AD上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/6bc1ec29-a733-4d0c-8f63-d045a8af52f3.png?resizew=297)
(1)若BP平分∠ABD,交AE于点G,PF⊥BD于点F,如图①,证明四边形AGFP是菱形;
(2)若PE⊥EC,如图②,求证:AE•AB=DE•AP;
(3)在(2)的条件下,若AB=1,BC=2,求AP的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/6bc1ec29-a733-4d0c-8f63-d045a8af52f3.png?resizew=297)
(1)若BP平分∠ABD,交AE于点G,PF⊥BD于点F,如图①,证明四边形AGFP是菱形;
(2)若PE⊥EC,如图②,求证:AE•AB=DE•AP;
(3)在(2)的条件下,若AB=1,BC=2,求AP的长.
2020·山东济南·一模 查看更多[4]
2020 年山东省济南市中考数学模拟试题(已下线)专题05 四边形《备战2020年中考真题分类汇编》(山东省)山东省烟台市福山区2020-2021学年八年级下学期期末数学试题2021年山东省威海市中考数学模拟试卷(三)
更新时间:2020-01-27 17:26:12
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【推荐1】【问题情境】
如图1,小明把三角板
(
)放置到矩形
中,使得顶点E、F、G分别落在
、
、
上,你发现线段
与
有什么数量关系?
直接写出结论:______(不用证明).
【变式探究】
如图2,小明把三角板
(
)放置到矩形
中,使得顶点E、F、G分别在
边上,若
,
,求
的长.
【拓展应用】
如图3,小明把三角形
放置到平行四边形
中,使得顶点E、F、G分别落在
边上,若
,
,
,求出
的值.
如图1,小明把三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd82f3c96014272fa70e863b18ea67d8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
直接写出结论:______(不用证明).
【变式探究】
如图2,小明把三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd82f3c96014272fa70e863b18ea67d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
【拓展应用】
如图3,小明把三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图矩形
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,E是边
上的一点,
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,
于点M,F,过点B作
于点G,
交
于点H.
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(1)求证:
;
(2)当
时,求
的值;
(3)当
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(1)求证:
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(2)当
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解题方法
【推荐3】(1)如图①,点A,B是直线l同侧的两点,作
于点C,作
于点D,点P是
上一动点,连接PA,PB,若AC = 3,BD = 5,CD = 6,则PA + PB的最小值为 ______.
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(2)如图②,在平行四边形ABCD中,AB = 6,BC = 8,∠ABC = 60°,∠ABC的平分线交AD于点E,点F在边BC上,点P是线段BE上的一个动点,连接PC,PF,若CF = 3,求PC + PF的最小值.
(3)如图③,在平行四边形ABCD中,对角线AC与BD交于点O,将△BCD沿BD翻折到△BED处,点P为对角线BD上一动点,点M,N分别为PB,PD中点,连接AM,EN,若
,BC = 8,∠BAC = 90°,求AM + EN的最小值.(点P不与B,D重合)
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(2)如图②,在平行四边形ABCD中,AB = 6,BC = 8,∠ABC = 60°,∠ABC的平分线交AD于点E,点F在边BC上,点P是线段BE上的一个动点,连接PC,PF,若CF = 3,求PC + PF的最小值.
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【推荐1】有一边是另一边的
倍的三角形叫做智慧三角形,这两边中较长边称为智慧边,这两边的夹角叫做智慧角.
(1)在Rt△ABC中,∠ACB=90°,若∠A为智慧角,则∠B的度数为______;
(2)如图①,在△ABC中,∠A=45°,∠B=30°,求证:△ABC是智慧三角形;
(3)如图②,△ABC是智慧三角形,BC为智慧边,∠B 为智慧角,A(3,0),点B,C在函数y=
(x>0)的图像上,点C在点B的上方,且点B的纵坐标为
.当△ABC是直角三角形时,求k的值.
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(1)在Rt△ABC中,∠ACB=90°,若∠A为智慧角,则∠B的度数为______;
(2)如图①,在△ABC中,∠A=45°,∠B=30°,求证:△ABC是智慧三角形;
(3)如图②,△ABC是智慧三角形,BC为智慧边,∠B 为智慧角,A(3,0),点B,C在函数y=
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【推荐2】如图,AB是半圆O的直径,E是弧BC的中点,OE交弦BC于点D,点F为OE的延长线上一点且OC2=OD•OF.
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(2)已知DE=2,tan∠BAC=
.
①求⊙O的半径;
②求sin∠BAD的值.
(1)求证:CF为⊙O的切线.
(2)已知DE=2,tan∠BAC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
①求⊙O的半径;
②求sin∠BAD的值.
![](https://img.xkw.com/dksih/QBM/2018/1/3/1852542386561024/1856927456411648/STEM/590d0f8cb3c3487bb35f988f05d4d89b.png?resizew=148)
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